The COVID-19 vaccination in 4,772 pregnant women in the province of Trento (North-East Italy). Characteristics of vaccinated women.

Objectives: to investigate vaccine uptake among pregnant women during the 2nd and 3rd trimester of pregnancy. To describe the factors influencing vaccine uptake during pregnancy, comparing sociodemographic and clinical characteristics of pregnant women who were vaccinated during the 2nd or 3rd trimester with those who were not vaccinated, despite having the indication for vaccination.

Design: observational study with a cross-sectional approach and prevalence estimation in the population of women who gave birth in the study period, through record linkages between the ministry information flow Birth assistance certificate, the Regional vaccination register and the Italian flow for SARS-CoV-2 infections.

Setting and participants: the study included all the 4,772 pregnant women living in Trentino (north-east Italy), who were in the 2nd or 3rd trimester of pregnancy between the 5th May 2021 and the 28th February 2022 and who delivered in Trentino.

Main outcome measures: vaccine uptake among pregnant women during the 2nd and 3rd trimester of pregnancy. Results: 33.3% of pregnant women got vaccinated with at least one dose of vaccine during the 2nd or 3rd trimester of pregnancy. Independent factors associated with vaccine uptake in the 2nd or 3rd trimester were the mother's citizenship, educational level, occupational status and age.

Conclusions: the proportion of women who received at least one dose of COVID-19 vaccine during pregnancy was low. The results are important to start efficient actions to promote vaccination in pregnant women, particularly in the most vulnerable ones (unemployed, foreigners and with a low educational level), who appear to be less vaccinated frequently.